The old hotel we used to stay at has been ________________ (modern)

Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

Teachers ought not to swear in front of the children.

A. should not

B. need not

C. could not

D. don’t have to

272=2n==> n=272:2=136 tick nha bạn

P=7(1+7+7²+7³+...+7²⁰¹⁵)

P=7[(1+7+7²+7³)+(7⁴+7⁵+7⁶+7⁷)+...+(7²⁰¹²+7²⁰¹³+7²⁰¹⁴+7²⁰¹⁵)]

P=7[400+7⁴(1+7+7²+7³)+...+7²⁰¹²(1+7+7²+7³)]

P=7[400(1+7⁴+...+7²⁰¹²)]

P=20²[7(1+7⁴+...+7²⁰¹²)] chia hết cho 20² (đpcm)