The common difference of 2 different AP's are equal if the 1st term of the 1st AP is 5 more than the last term of 2nd AP.If the 7th terms of the 1st AP is 28 and the 8th term of the AP is 29 then find both the different AP
Answers
Answer:
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Step-by-step explanation:
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Answer:
For first A.P
S1
n
=(
2
n
)(2n+(n−1)d)
S1
30
=(
2
30
)(2×3+(30−1)d)
S1
30
=15(6+29d)
S1
30
=90+435d
For second AP
S2
n
=(
2
n
)(2n+(n−1)d)
S2
30
=(
2
30
)(2×8+(30−1)d)
S2
30
=15(16+29d)
S2
30
=240+435d
Difference between S1
30
−S2
30
=(90+435d)−(240+435d)=150