2) Which term of the A.P. 1,4,7,........ is 70 ?
(a) 24th (b) 22nd (c) 21st
(d) 23rd
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2
Answer:
the ans is 21st
Step-by-step explanation:
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Answered by
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a = 1
d = 3
an = 70
an = a+(n-1)d
70 = 1+(n-1)3
70 = 1+3n-3
70 = -2+3n
70+2 = 3n
72 = 3n
72/3 = n
24 = n
70 is 24th term of the given AP.
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