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The 11^("th") term and the 21^("st") ter...

The `11^("th")` term and the `21^("st")` term of an A.P. are 16 and 29 respectively then find:
a. The first term and common difference.
b. The `34^("th")` term.
c. ‘n’ such that `t_(n) = 55`.

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