Q. 2 B

# Find the sum of t

Answer :

The arithmetic progression is given.
Here first term is 7 and common difference is Last term l = 84

Let no. of terms be n.
Since, an = a + (n - 1)d

Where,

a = First term of AP
d = Common difference of AP
and no of terms is ‘n’  22 = n – 1
n = 23

Since the sum of n terms is
Sn = So sum of 23 terms S23 ]
= 11.5 [14 + 22 × 3.5]
= 11.5[ 14 + 77]
= 11.5 × (91)
= 1046.5

Hence, Sum is 1046.5 = .

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