Question

Find the sum of first 16 terms of the A.P. 1,1.5, 2,2.5. .....​

Answer 1

Step-by-step explanation:

a = 1,

d = a2-a1 = 1.5 - 1 = 0.5

Sn = n ( 2a + (n-1)d)

2

=16(2×1 + (16 - 1)×0.5)

2

= 8(2 + 17.5)

= 8(19.5)

=156

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Answer 2

Answer:

76

Step-by-step explanation:

a=1

d=0.5

n=16

Sn=n/2(2a+(n-1)d)

=16/2(2+(16-1)0.5)

=8(2+(15)0.5)

=8(2+7.5)

=8(9.5)

=76