Question

15. (a) Find 2 +7 +12 +17+ ... to 16 terms. sum of the number Ap​

Answer 1

Answer:

s = 632

Step-by-step explanation:

sum of n terms of AP, s= n/2[2a+(n-1)d]

where, n = no of terms= 16

a= first term =2

d = common difference =5Now putting all values in the formula, we have

s= 16/2[2×2 + (16-1)5] = 8[4+15×5] = 8×79 = 632

Answer 2

Answer:

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