Question

29. In an AP, the 13th term is 22 and d=-1/2, then the first term is
O (a) 25
O (6) 26
O (c) 27
0 (d) 28​

Answer 1

Answer:

option d

a= 28

Step-by-step explanation:

see carefully

Given:

An=22

n= 13

d= -1/2

Find:

first term ,a

Solution:

An = a + (n-1) d

22 = a + ( 13-1 )× (-1/2)

22=a+ [12 × -1/2 ]

22 = a +[-6]

22=a-6

22 + 6 = a

28= a

option d

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