Language in Scheme

The following pattern of numbers is called Pascal's triangle. rowo 18 tow1 111 w 0121 w 110111 towa 640 The numbers at the edge of the triangle are all 1, and each number inside the triangle is the sum of the two numbers above it. a. [5 marks) Write a procedure that computes elements of Pascal's triangle given row and column indices. Any invalid indices should return a value of 0. For example, (pascals 0 0) - 1 (pascals 20) - 1 (pascals 21) + 2 (pascals 4 2) + 6 b. [7 marks] Using your solution to the previous part, write a procedure (printTriangle n) that prints n rows of Pascal's triangle to the screen. For example, (printTriangle 5) 1 2 1 1 3 3 1 14 6 4 1 The following pattern of numbers is called Pascal's triangle. rowo 18 tow1 111 w 0121 w 110111 towa 640 The numbers at the edge of the triangle are all 1, and each number inside the triangle is the sum of the two numbers above it. a. [5 marks) Write a procedure that computes elements of Pascal's triangle given row and column indices. Any invalid indices should return a value of 0. For example, (pascals 0 0) - 1 (pascals 20) - 1 (pascals 21) + 2 (pascals 4 2) + 6 b. [7 marks] Using your solution to the previous part, write a procedure (printTriangle n) that prints n rows of Pascal's triangle to the screen. For example, (printTriangle 5) 1 2 1 1 3 3 1 14 6 4 1