23. The sum of first 6 terms of an AP is 42. The ratio of its 11th term to its 33th term is 1:3. Calculate the first term
of an AP
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23. The sum of first 6 terms of an AP is 42. The ratio of its 11th term to its 33th term is 1:3. Calculate the first term
of an AP
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Step-by-step explanation:
S6=n/2[2a+(n-1)d]
42=6/2[2a+5d]
42=6a+15d
14=2a+5d
a+10d/a+32d=1/3
3a+30d=a+32d
2a-2d=0
2a+5d=14
2a-2d=0
7d=14
d=2
2a-2d=0
2a=4
a=2
Answer:
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