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
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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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